About this item

• Quieter Braking Performance – Redesigned arm shape and heat-dissipating paint reduce noise and maintain smooth, consistent braking on long descents
• Superior Heat Management – Enhanced rotor structure minimizes heat deformation for reliable performance in steep, technical terrain
• External Serration Lock Ring – Secure, tool-friendly installation for Shimano Center Lock hubs (lock ring included)
• Robust & Lightweight Design – Optimized construction delivers strength without sacrificing weight for high-performance road, gravel, or MTB setups
• Versatile Size Options – RT-CL900 available in 140mm, 160mm, 180mm, and 203mm diameters to match your braking needs

The Shimano RT-CL900 Disc Brake Rotor sets a new standard for quiet, controlled braking in challenging conditions. Built with a revised arm shape and heat-dissipating paint, it dramatically reduces noise caused by rotor heat deformation while maintaining exceptional braking power and consistency. Ideal for aggressive road, gravel, or MTB riding, this rotor includes an external serration lock ring for quick, secure installation on Shimano Center Lock hubs. Available in multiple sizes, the RT-CL900 delivers the perfect balance of robust construction, lightweight performance, and industry-leading heat management for confident descents.